Bismuth(II) tetra(trifluoroacetate) acts as a metalloligand toward transition-metal units to yield heterobimetallic homoleptic carboxylates [BiM(O2CCF3)4] (M=Rh, Ru; see picture). The heterometallic molecules maintain a paddle-wheel structure, with a single bond between bismuth and the transition-metal atom, and behave as one-ended Lewis acids in solution and in the solid state.
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Dikarev et al. (2005) studied this question.
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